许多因素都很重要，如阶级、性别、年龄及民族。
Many factors are important, for example class, gender, age and ethnicity.
方法：对西宁及扬州地区两组病人从发病年龄、时间、民族、原发病等方面进行比较。
Methods:To make a comparison between the two in many aspects, such as age?time?nationality and the original disease, et al.
方法：对西宁及扬州地区两组病人从发病年龄、时间、民族、原发病等方面进行比较。
Methods:To make a comparison between the two in many aspects, such as age?time?nationality and the original disease, et al.
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